If your vehicle carries you between jobs, client meetings, supply runs, showings, deliveries, or other business stops, mileage can become one of your most repeated records. It can also become one of the hardest records to recreate after the year ends.

The IRS requires adequate records to substantiate vehicle expenses. A useful log gives you a consistent trail from the trip to the business reason behind it.

Record the facts of each business trip

For each trip, capture the date, starting point, destination, business purpose, and business miles. If your app records locations automatically, add the business purpose while the trip is still easy to recognize.

A purpose such as “business” is too vague to help later. “Client meeting — Oak Street project” or “Supply pickup — packaging materials” gives the trip context.

A five-part entryDate · from/to · business purpose · business miles · related client or job, when relevant.

Separate business use from personal use

If a vehicle is used for both business and personal driving, only the business portion belongs in the business-mile total. Keep personal trips out of the business log or clearly mark them as personal.

Commuting between your home and a regular place of work is generally treated differently from travel between business locations. Home-office status and other facts can affect the analysis, so this is a good area to discuss with a qualified tax professional when your pattern is not straightforward.

Keep the rate separate from the miles

Your log should preserve the actual business miles. The deduction calculation comes later. That distinction matters because the standard mileage rate can change, and the method available to you can depend on how the vehicle was used and treated in earlier years.

For 2026, the IRS currently lists different business standard mileage rates for the first and second halves of the year: 72.5 cents per mile from January 1 through June 30, and 76 cents per mile from July 1 through December 31. Keeping the trip date with each entry allows the correct period to be applied.

Do not lose the expenses outside the rate

The IRS notes that business parking fees and tolls can generally be separately deductible whether you use the standard mileage method or actual expenses. Save those records and link them to the trip when practical.

If you are using the actual-expense method, the record set is broader: gas, repairs, tires, insurance, registration fees, lease payments or depreciation, and the calculation that divides business use from personal use.

Use a routine you can repeat

Choose one capture tool — an app, spreadsheet, paper log, or calendar-based workflow. Then review it at a fixed interval. Weekly is usually easier than trying to recognize dozens of destinations at month-end.

  1. Record or import the trips.
  2. Mark business versus personal.
  3. Add a specific business purpose.
  4. Save toll and parking receipts.
  5. Review the total before the month closes.

A mileage log works because of the routine, not because of the logo on the app.

Common questions

Do I need a mileage app, or is a spreadsheet enough?
Either works. The log depends on the routine, not the tool — pick one capture method you will actually repeat, then review it at a fixed interval. Weekly review is usually easier than recognising dozens of destinations at month-end.
What has to be in each entry?
The date, the starting point, the destination, the business purpose, and the business miles. A purpose such as "business" is too vague to help later; "Client meeting — Oak Street project" gives the trip context.
Are parking and tolls covered by the standard mileage rate?
The IRS notes that business parking fees and tolls can generally be separately deductible whether you use the standard mileage method or actual expenses. Save those records and link them to the trip when practical.
Does driving from home to work count as business mileage?
Commuting between your home and a regular place of work is generally treated differently from travel between business locations. Home-office status and other facts can affect the analysis, so discuss it with a qualified tax professional when your pattern is not straightforward.
Why record the miles instead of the deduction amount?
Your log should preserve the actual business miles; the calculation comes later. The standard mileage rate can change — 2026 has different rates for the first and second halves of the year — so keeping the trip date with each entry lets the correct period be applied.

This article is for educational purposes only and does not constitute tax, legal, or financial advice. Consult a qualified tax professional about your situation.

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